Fail-safe circuit mechanism for generating a pulse indicating th

Details Fail-safe circuit mechanism for generating a pulse indicating th Fail-safe circuit mechanism for generating a pulse indicating th

1981-01-26

1984-01-24

Farley, Richard A.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181118, 367144, G01V 138, G01V 114

Patent

active

044270917

ABSTRACT:
A new circuit is added to the old electrical circuit including two electrodes underwater positioned very close to a gas exhausting gun gaseous exhaust such as an air gun, wherein the exhaust from the firing gas exhausting gun momentarily blows away the conductive sea water from one or both of the electrodes to produce a high voltage pulse due to the large increase in resistance in the circuit indicating the precise moment of firing of the gas exhausting gun.
This new circuit added to the above circuit is a circuit polarity reversing circuit which includes particularly a positive current generator, a negative current generator, and a sea ground for forming a third electron source when any of the two electrodes becomes defective, thus forming a fail-safe system. Further, the resultant circuit changes polarity of the electrodes after each firing of the gas exhausting gun and periodically reverses the current to the electrodes for reduced plating action on the electrodes, for reduced cross coupling between other channels, and for providing a fail-safe system.

REFERENCES:
patent: 1212438 (1917-01-01), Bauder
patent: 3206615 (1965-09-01), La Pointe
patent: 3503861 (1970-03-01), Volpe
patent: 3840439 (1974-10-01), Marsh
patent: 4106585 (1978-08-01), Huizer
patent: 4110740 (1978-08-01), Akita et al.
patent: 4141431 (1979-02-01), Baird
patent: 4165509 (1979-08-01), Betts et al.

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